Exodus 8:24

And Pharao said, I [will] let you go, and do ye sacrifice to your God in the wilderness, but do not go very far away: pray then for me to the Lord.

And the dog-fly came in abundance into the houses of Pharao, and into the houses of his servants, and into all the land of Egypt; and the land was destroyed by the dog-fly.

Yahweh did so; and there came grievous swarms of flies into the house of Pharaoh, and into his servants’ houses. In all the land of Egypt the land was corrupted by reason of the swarms of flies.